Anim. feed sci. technol. Anim. feed sci. technol. Rumen protozoal dynamics during the transition from milk/grass to high-concentrate based diet in beef calves as affected by the addition of tannins or medium-chain fatty acids Yuste S. Universidad de Zaragoza Amanzougarene Z. Universidad de Zaragoza Fuente G. de la Vega A. de Universidad de Zaragoza Fondevila M. Universidad de Zaragoza 2019 research-article